﻿Low-Speed Positive H-lons in Hydrogen. 815 



through the gauze G x . These positive ions may be further 

 accelerated by the P.D. of y volts between the gauzes, 

 whence they pass into the ionization chamber G 2 D, where 

 the ionization they produce can be measured. The nickel 

 gauzes G-! and G 2 are of fine mesh, and are fitted on frames 

 so that they do not touch the glass walls of the main tube. 

 This lessens the possibility of a current leal 



cross the glass. 



Fiff. 1. 



A 



u 



© 6 



Fur. 2. 



+ 





+ 



-rrir 



F 



1 

 - 1 





i 

 i 



i 





C-- 



x--->k- 



V X | 



y 



-*- 



i 



A 



i 





i 

 i 











G| 





G 2 



One set of wires in each gauze is set vertical and the other 

 set horizontal so that the corresponding holes in the gauzes 

 are opposite. E x and E 2 are side electrodes for using a 

 cross-field to measure the ionization. 



Before fitting, the tube was thoroughly cleaned and dried. 

 After fitting to the supply tube, it was exhausted as much as 

 possible by an automatic mercury pump, the glass walls 



